Disk tumbler lock



" Feb. 12, 1935. M. FALK 1,990,933

DISK TUMBLER LOCK Filed April 15, 1935 M-rzir .2 0 A Maw:

Patented Feb. 12, 1935 9 UNITED STATES PATENT OFFICE." '1 A 6 Claims.

This invention relates to locks of the disk tumbler type and particularly to means for preventing the picking thereof. In the ordinary type of disk tumbler lock, it has been found possible by sufliciently clever manipulation to progressively shift the disks transversely to release position and to simultaneously turn the cylinder very slightly but suf iciently to prevent return movement of the disks. This has commonly been accomplished by the insertion of two separate tools, one to shift the disks transversely and the other to turn the cylinder and maintain transverse pressure thereon.

It is the general object of my present invention to provide an improved disk tumbler look so constructed that picking of the lock is rendered substantially impossible.

More specifically, my invention relates to the provision of a disk tumbler lock in which the lock cylinder is made in two independently rotatable portions, and in which the inner portion is so constructed that angular movement thereof is substantially impossible without the use of a key designed for the look.

I also provide improved means for holding the two portions of the cylinder in a cylinder sleeve and for limiting the amount of rotation of the cylinder relative to the sleeve.

My invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of the invention is shown in the drawing, in which Fig. 1 is a side elevation of my improved lock, with certain parts shown in section;

Fig. 2 is a plan view of the lock, looking in the direction of the arrow 2 in Fig. 1 but with the easing removed; I

Fig. 3 is a side elevation of the lock, looking in the direction of the arrow 3 in Fig. 2;

Fig. 4 is a transverse sectional elevation, taken along the line 44 in Fig. 2;

Fig. 5 is a side view of a locking member;

Fig. 6 is an end view of the cylinder sleeve, looking in the direction of the arrow 6 in Fig. 2;

Fig. '7 is an end view of the lock casing, 1ooking in the direction of the arrow '7 in Fig. 1;

Fig. 3 is an .end elevation of the front cylinder portion, taken along the line 88 in Fig. 3;

. Fig. 9 is a sectional elevation of the front cylinder portion, taken along the line 99 in Fig. 3;

Fig. 10 is an end elevation of the innercylinder portion, .taken along the line 10-10 in Fig. 3;

Fig. .11 isa sectionalend elevation ofthe inner.

Fig. 13 is a plan viewof a modified'construction.

Referring to the form of my invention shownim Figs. 1 to- 12, I have shown my invention embodied in a construction suitable-for lockingan' automobile door handle, but it should be under l0- stood that myimproved lock is capableof general:

application and is not limited to the specific ap plicationshown in the drawing.

Referring toFig. 1, I have shown my improved look as mounted in a casing 20, whichin this case comprises the hub portion of a door handle. The operative parts of my improved lock are preferably mounted in a sleeve 21, which sleeve is slidable in a cylindrical opening 22 in' the casing A look cylinder is rotatablewithin the sleeve 21 and comprises an outer cylinderportion'25 and an inner cylinder portion 25. A rod or shaft27 fixed to the inner cylinder portion 26 and forms a continuation thereof; said rod having a bearing-in a rearwardly extending tube 28 forming an? extension of the'casing 20.

The shaft 27 is. preferablyprovided with an annular groove 30 (Fig. 1) to=receive a locking pin 31 by which the shaft 27 and inner cylinder portion 26 are retained in predetermined axial position in the casing 20.

Theinner end of the sleeve 21 is provided with inwardly extending lugs 33 (Fig. 6)' adaptedto be received in slots '34' (Fig. 7) in the inner end of the bearing tube 28'. The sleeve 21 is thus held from rotation in the casing 20. Outward withdrawal of the sleeve 21 is prevented by engagement of an inner fiange35 (Fig. 1) of the sleeve against the inner end 36 of the'inner cylinder portion 26 which is secured to the rod 27. Consequentlywhen the locking pin 31 is'inserted,"the rod 27, inner cylinder portion 26 and sleeve 21 are all firmly retained in the casing 20.

A compressionspringx37 is'mounted in a recess in the casing 20 and engages the inner end of" the sleeve 21, forcing the same outward to apply frictional pressure to the inner end 360i the cylinderportion 2.6, so that the latter cannot be readily turned by the application of a slight force thereto.

A .coilspring 40 is mounted on the rodz27 and theoutwardly offset ends 41 of the spring 40 engage .the ends .42of a slot43 in the sleeve 21.- The oiiset'ends 41 .of-the spring .40. alsoengage shouldersAi at the innerend of theinner cylinderpore projection portion,

A compression spring 53 (Figs. 9 and 11) is provided for each disk tumbler 51 and engages a 54 at one side thereof. Each tumbler is also provided with a rectangular key opening 55 and with a lug 56 engaging a shoulder 57 to limit movement of the tumbler by the spring 53.

The-outer cylinder portion 25 is provided with a key-receiving slot 60 which is substantially of the width of the key throughout its length, but

theinner cylinderportion 26 is provided with a key opening having the lower portion 62 substanthe key but having the axial tially the width of portion of circular outline, as indicated at 63,

and for a purpose to be described.

The outer cylinderportion 25 is also provided with an annular groove 65 (Fig. 3) having a stop pin 66 therein, and the sleeve 21 is provided with a segmental slot 67 (Fig. 2) to receive a locking member 70 (Figs. 4 and The member '70 is provided with end projections '71 and when'in serted in the slot 67, the member '70 projects into the groove 65 and the end projections '71 extend within the edge portions of the sleeve 21 as clearly shown in Fig. 4.

'The locking member '70 thus firmly retains the cylinder portion 25 in the sleeve 21, and the lugs 71 limit angular movement of the cylinder portion 25 by engaging the stop .pin 66 when the cylinder is rotated one-quarter of a revolution in either direction. 7

.When the cylinder portions and disk tumblers are inserted in the sleeve'21'as shown in Fig.2 and the locking memberlO is placed in the slot 67, the 'partsare securely held from displacement and may be handled as a unit for insertion in the casing 20 or for placing many other operative location.

When a key 80 is inserted in the lock, the disk tumblers 51 aremoved to the-centralor inoperative position shown inFig. l2 andthe key may then be turned, partially rotating the rod 27 and rendering an eccentric pin 81 (Fig. 1) operative to retract a locking bolt or to effect other unlocking conditions. The particular apparatus associated with my improved lock forms no part of the present invention and may be varied as desired.

When an attempt is made to pick the lock herein described, it may be found possible to shift the disk tumblers 51 in the outer cylinder portion 25 and to turn said portion sufiicientlyto prevent return movement of these tumblers, but such movement cannot be communicated to the inner cylinder portion 26, as this is held frictionally from displacement by the pressure of the spring Furthermore, any wire or tool inserted in the outer cylinder portion 25 cannot be wider than the slot 60 (Fig. 8) and atool oi this width will find no seat in the circular opening 63 (Fig. in the inner cylinderportion 26 against which pressure can be exerted for shifting the cylinder that slot. Therefore, such a picking tool portion 26 angularly to hold the disk plungers ,51 if transverse displacement thereof is accomplished. It will be'obvious that no picking tool can be inserted through the slot 60 wider than will not reach across the circular opening 63. Such a tool will simply extend into the cylinder opening .63 and cannot be pressed against its con: caved cylindrical surface or even touch it. Therefore, it cannot be used to turn the inner cylinder portion 26. f

Consequently it is practically impossible to unlock the device shown and described except by the use of a key which is designed for the particular lock.

In Fig. 13 I have shown a slight modification of my invention in which cylinder portions 90 and 91 are mounted in a sleeve 92, and in which an eccentric pin 93 is provided directly on the inner cylinder portion 91. In this case the sleeve 92 has a straight cylindrical opening therein and a locking member 94 similar to the locking mem ber 70 previously described is provided for each of the cylinder portions 90 and 91. V

In certain embodiments of my invention, the cylinder sleeve may be omitted and the inner and outer cylinder portions may be-inserted directly in a handle or' other casing.

Having thus described my invention and the advantages thereof, I do not wish to be limitedv to the details herein disclosed, otherwise than as set forth in the claims but what I claim is:-

l. A-disk tumbler lock comprising a casing, a

cylinder in said casing made with independently rotatable outer and inner portions, and springactuated disk tumblers mounted for transverse sliding movement in said cylinder portions, said outer cylinder portion having an opening of a shape to receive a key extending throughout its entire length, said inner cylinder portion having an opening therein to receive the inner end of a key inserted in said lock, and the last named opening being in part circular in crosssection. 2. A disk tumbler lock comprising acasing a sleeve longitudinally insertable in said casing, means to prevent withdrawal of said sleeve from said casing, a cylinder in said sleeve madewith independently rotatable outer and inner portions, and spring-actuated disk tumblers mounted for transverse sliding movement in said cylinder'porticns, said cylinder portions, each-having an opening therein to receive a key, insert-i ed in saidlock, said openings normally being located in exact alignment and said opening in;

the inner cylinder portion being in part circular in cross section. v

. 3. A disk tumbler lock comprising-a casing, a sleeve in said casing a cylinder insaid sleeve made with independently rotatable outer and inher portions, spring-actuated disk tumblers mounted for transverse sliding movement in said,

cylinder portions, said sleeve having" a slot and one of said cylinder portions having an annular groove in a plane transverse to the axis of the cylinder portion longitudinally aligned with said slot when the lock is assembled, and a segmental annular locking member insertable in said slot and groove to hold said cylinder portion from axial displacement in said sleeve, said locking member having end projections at the inner portions thereof extending within the edge portions of said sleeve adjacent said slot when the parts are assembled.

4. A disk tumbler lock comprising a casing, a sleeve longitudinallyinsertable in said casing,

means to prevent withdrawal of said sleeve from said casing, a cylinder in said sleeve made with independently rotatable outer and inner portions, spring-actuated disk tumblers mounted for transverse sliding movement in said cylinder portions, said sleeve having a slot and one of said cylinder portions having an annular groove longitudinally aligned with said slot when the lock is assembled, and a segmental annular locking member insertable in said slot and groove and secured therein by said casing when the lock is placed therein, whereby said cylinder portion is held from axial displacement in said sleeve, said locking member having end projections at the inner portions thereof extending within the edge portions of said sleeve adjacent said slot when the parts are assembled.

5. A disk tumbler lock comprising a casing, a cylinder in said casing made with independently rotatable outer and inner portions, spring-actuated disk tumblers mounted for transverse sliding movement in said cylinder portions, said sleeve having a slot and one of said cylinder portions having an annular groove in a plane transverse to the axis of the cylinder portion longitudinally aligned with said slot when the lock is assembled, a segmental annular locking member insertable in said slot and groove to hold said cylinder portion from axial displacement in said sleeve said locking member having inner end projections, and a stop in said cylinder portion engaging said inner end projections of said locking member to limit rotation of said cylinder portion.

6. A disk tumbler lock comprising a casing, a cylinder in said casing made with independently rotatable outer and inner portions, and springactuated disk tumblers mounted for transverse sliding movement in said cylinder portions, said inner cylinder portion having an opening therein to receive the inner end of a key inserted in said lock, and said opening being in part laterally enlarged to provide clearance for preventing rotary actuation of said inner portion by a pick capable of being inserted through the outer portion.

MORRIS FALK. 

